1.Do you still remember, while you grow up from baby to kid, when you began to learn the difference between the living and non-living things?
2.Chemists make little bubbles by mixing phospholipid and certain protein in water. What would this phenomenon related to the origin of life?
3.Compare the tracheobronchial tree of lung with Fucus, what kind of functions are provided by these two similar “patterns”?
4.If you are to make the “sub-robots”, what kind of features will you add to them to provide proper functions in the cell?
5.How do you distinguish genetically modified organisms?
6.Suppose two kinds of fishes. One drinks water, excrete salt by the gill, their kidneys generate little amount of urine, and the water inside exudes out of the body. The other does not drink water, the gill absorb salt, their kidneys generate large amount of water, and the water permeates into the body.
Which one do you think to live in the sea, which in fresh water? Why?
7.Why are the neural cells seldom replaced?
8.During the regeneration of liver, the total mass of the liver increases, but how come the number of newly produced liver cells stays the same?
9.In the World War I, the opponent sides of army tried to avoid bomb the enemy’s grain carriers. Why?
10. The finding has been used in support of a controversial suggestion by some scientists that the meteorite contains microscopic and chemical evidence of ancient life indigenous to Mars. The length of the tube-like structure is 20 nm. Based on this length, explain why people are doubt of its being a living form.
11.Horses bend their legs toward the rear, while human beings bend their legs toward the front. Does this mean their legs are not homologous?
12.If, on each bumping event between atoms or molecules, their chemical bonds are rendered broken and reform to make new molecules, what would the living world look like?
How does enzymes aid in the regulation of chemical reactions?
- 1 decade agoFavorite Answer
1.Don't remember. I wasn't aware of the significance of such differentiation at the time.
7.First of all, it is not universally true that brain cells are never replaced when they die. That used to be what we thought, but about 7 years ago we started seeing evidence of cell replacement when we looked carefully at the areas of the brain involved in the formation of memory and control of emotions, especially the hypothalamus. This is ongoing throughout life, although how fast and how much it happens depends on a complex mix of genetics and life events.
It looks as if some of the drugs that we use to treat depression have the effect of stimulating cell growth and cell division in the hypothalamus, which is accidental and unintended, but seems like it has something to do with *how* the drugs lift the memory and emotional effects of depression. This is currently being investigated, to see if we can come up with something a bit more targeted on the one hand, or which has a similarly moderately regenerative effect in other areas of the brain on the other.
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2008-04-05 20:16:29 補充：
9. That would have been uncivilized. The war was fought between infantryman, not civilians. Attacking the food supply would have been seen as an attack on civilians.Source(s): me, answerbag.com, google